Halak, 27, has appeared in five games this season posting a 3-0-0 record including a 2.10 goals-against average and an .889 save percentage, and is tied for the NHL lead with two shutouts. He had been out with a groin injury.
The Blues are 0-3-1 since starting the season with six wins in their first seven games.
The team also assigned goaltender Jake Allen to their American Hockey League (AHL) affiliate, Peoria Rivermen.
I kept refreshing the page on the NHL website after the second round and I was shocked he lasted that long. I'm sure the Coyotes were pretty happy to get him. He's such a good player and he plays big in big games.
— Arizona forward Henrik Samuelsson on prospect Edgars Kulda being drafted by the Coyotes